如何将其添加到数组列表中？

Question

I want to add these vehicles to an arraylist but it has to be done by the addVehicle method in the CourierManagementSystemImpl class. I'm not sure how to do it.

Part of public class CMSTestHarness:

//Arraylist
ArrayList<Vehicle> vehicles = new ArrayList<Vehicle>(); 

// Van(registrationNo, make, model, year, odometer, serviceInterval)
cms.addVehicle(new Van("v1", "Toyota", "Sienna", 1998, 0.0, 500.0));
cms.addVehicle(new Van("v2", "Volkswagen", "Routan S", 2009, 0.0, 1000.0));

Part of CourierMangementSystemImpl class

@Override
    public void addVehicle(Van van) {
        // TODO Auto-generated method stub
    }

Answer 1

For example, "vehicles" is the field of CMS object. Pass the parameters to the method addVehicle. And in this example, I used string object instead of Van object for simplicity.

public static void main(String[] args) {
    CMS cms = new CMS();
    // * This is Van object.
    cms.addVehicle(new Van("v1", "Toyota", "Sienna", 1998, 0.0, 500.0));
    cms.addVehicle(new Van("v2", "Volkswagen", "Routan S", 2009, 0.0, 1000.0));
    for (String s : cms.getVehicles())
        System.out.println(s);
}

public class CMS {

    private ArrayList<String> vehicles = new ArrayList<String>();

    public ArrayList<String> getVehicles() {
        return this.vehicles;
    }

    public void addVehicle(String van) {
        vehicles.add(van);
    }

}